The drug may also impair a person's ability to drive a car. People taking Horizant should not drive a car or operate heavy machinery until they have enough experience with the drug to determine whether their driving ability is affected.

Horizant is a slightly less active form of the antiepileptic drug gabapentin. This type of antiepileptic drug increases the risk of suicidal thoughts and behaviors.

Horizant also increases these risks, and people taking the drug should talk to their health care provider about any new or worsening depression or suicidal thoughts.

The drug was developed by XenoPort Inc. and is marketed by GlaxoSmithKline.